axmol/cocos2dx/misc_nodes/CCRenderTexture.cpp

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2009      Jason Booth

http://www.cocos2d-x.org

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#include "CCConfiguration.h"
#include "CCRenderTexture.h"
#include "CCDirector.h"
#include "platform/platform.h"
#include "CCImage.h"
#include "support/ccUtils.h"
#include "CCFileUtils.h"
#include "CCGL.h"

namespace cocos2d { 

// implementation CCRenderTexture
CCRenderTexture::CCRenderTexture()
: m_pSprite(NULL)
, m_uFBO(0)
, m_nOldFBO(0)
, m_pTexture(0)
, m_ePixelFormat(kCCTexture2DPixelFormat_RGBA8888)
{
}

CCRenderTexture::~CCRenderTexture()
{
    removeAllChildrenWithCleanup(true);
    ccglDeleteFramebuffers(1, &m_uFBO);
}

CCSprite * CCRenderTexture::getSprite()
{
	return m_pSprite;
}
void CCRenderTexture::setSprite(CCSprite* var)
{
	m_pSprite = var;
}

CCRenderTexture * CCRenderTexture::renderTextureWithWidthAndHeight(int w, int h, CCTexture2DPixelFormat eFormat)
{
    CCRenderTexture *pRet = new CCRenderTexture();

    if(pRet && pRet->initWithWidthAndHeight(w, h, eFormat))
    {
        pRet->autorelease();
        return pRet;
    }
    CC_SAFE_DELETE(pRet);
    return NULL;
}

CCRenderTexture * CCRenderTexture::renderTextureWithWidthAndHeight(int w, int h)
{
	CCRenderTexture *pRet = new CCRenderTexture();

    if(pRet && pRet->initWithWidthAndHeight(w, h, kCCTexture2DPixelFormat_RGBA8888))
	{
		pRet->autorelease();
		return pRet;
	}
	CC_SAFE_DELETE(pRet)
	return NULL;
}

bool CCRenderTexture::initWithWidthAndHeight(int w, int h, CCTexture2DPixelFormat eFormat)
{
	// If the gles version is lower than GLES_VER_1_0, 
	// some extended gles functions can't be implemented, so return false directly.
	if (CCConfiguration::sharedConfiguration()->getGlesVersion() <= GLES_VER_1_0)
	{
		return false;
	}

    bool bRet = false;
    do 
    {
        w *= (int)CC_CONTENT_SCALE_FACTOR();
        h *= (int)CC_CONTENT_SCALE_FACTOR();

        glGetIntegerv(GL_FRAMEBUFFER_BINDING_OES, &m_nOldFBO);

        // textures must be power of two squared
        unsigned int powW = ccNextPOT(w);
        unsigned int powH = ccNextPOT(h);

        void *data = malloc((int)(powW * powH * 4));
        CC_BREAK_IF(! data);

        memset(data, 0, (int)(powW * powH * 4));
        m_ePixelFormat = eFormat;

        m_pTexture = new CCTexture2D();
        CC_BREAK_IF(! m_pTexture);

        m_pTexture->initWithData(data, (CCTexture2DPixelFormat)m_ePixelFormat, powW, powH, CCSizeMake((float)w, (float)h));
        free( data );

        // generate FBO
        ccglGenFramebuffers(1, &m_uFBO);
        ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_uFBO);

        // associate texture with FBO
        ccglFramebufferTexture2D(CC_GL_FRAMEBUFFER, CC_GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_pTexture->getName(), 0);

        // check if it worked (probably worth doing :) )
        GLuint status = ccglCheckFramebufferStatus(CC_GL_FRAMEBUFFER);
        if (status != CC_GL_FRAMEBUFFER_COMPLETE)
        {
            CCAssert(0, "Render Texture : Could not attach texture to framebuffer");
            CC_SAFE_DELETE(m_pTexture);
            break;
        }

        m_pTexture->setAliasTexParameters();

        m_pSprite = CCSprite::spriteWithTexture(m_pTexture);

        m_pTexture->release();
        m_pSprite->setScaleY(-1);
        this->addChild(m_pSprite);

        ccBlendFunc tBlendFunc = {GL_ONE, GL_ONE_MINUS_SRC_ALPHA };
        m_pSprite->setBlendFunc(tBlendFunc);

        ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_nOldFBO);
        bRet = true;
    } while (0);
    return bRet;
    
}

void CCRenderTexture::begin()
{
	// Save the current matrix
	glPushMatrix();

	CCSize texSize = m_pTexture->getContentSizeInPixels();

	// Calculate the adjustment ratios based on the old and new projections
	CCSize size = CCDirector::sharedDirector()->getDisplaySizeInPixels();
	float widthRatio = size.width / texSize.width;
	float heightRatio = size.height / texSize.height;

	// Adjust the orthographic propjection and viewport
	ccglOrtho((float)-1.0 / widthRatio,  (float)1.0 / widthRatio, (float)-1.0 / heightRatio, (float)1.0 / heightRatio, -1,1);
    glViewport(0, 0, (GLsizei)texSize.width, (GLsizei)texSize.height);
//     CCDirector::sharedDirector()->getOpenGLView()->setViewPortInPoints(0, 0, texSize.width, texSize.height);

	glGetIntegerv(CC_GL_FRAMEBUFFER_BINDING, &m_nOldFBO);
	ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_uFBO);//Will direct drawing to the frame buffer created above

	// Issue #1145
	// There is no need to enable the default GL states here
	// but since CCRenderTexture is mostly used outside the "render" loop
	// these states needs to be enabled.
	// Since this bug was discovered in API-freeze (very close of 1.0 release)
	// This bug won't be fixed to prevent incompatibilities with code.
	// 
	// If you understand the above mentioned message, then you can comment the following line
	// and enable the gl states manually, in case you need them.

	CC_ENABLE_DEFAULT_GL_STATES();	
}

void CCRenderTexture::beginWithClear(float r, float g, float b, float a)
{
    this->begin();

	// save clear color
	GLfloat	clearColor[4];
	glGetFloatv(GL_COLOR_CLEAR_VALUE,clearColor); 

	glClearColor(r, g, b, a);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	// restore clear color
	glClearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);     
}

void CCRenderTexture::end()
{
	ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_nOldFBO);
	// Restore the original matrix and viewport
	glPopMatrix();
	CCSize size = CCDirector::sharedDirector()->getDisplaySizeInPixels();
//	glViewport(0, 0, (GLsizei)size.width, (GLsizei)size.height);
    CCDirector::sharedDirector()->getOpenGLView()->setViewPortInPoints(0, 0, size.width, size.height);
}

void CCRenderTexture::clear(float r, float g, float b, float a)
{
	this->beginWithClear(r, g, b, a);
	this->end();
}

bool CCRenderTexture::saveBuffer(const char *szFilePath)
{
	bool bRet = false;

	CCImage *pImage = new CCImage();
	if (pImage != NULL && getUIImageFromBuffer(pImage))
	{
		bRet = pImage->saveToFile(szFilePath);
	}

	CC_SAFE_DELETE(pImage);
	return bRet;
}
bool CCRenderTexture::saveBuffer(const char *fileName, int format)
{
	bool bRet = false;
	CCAssert(format == kCCImageFormatJPG || format == kCCImageFormatPNG,
			 "the image can only be saved as JPG or PNG format");

	CCImage *pImage = new CCImage();
	if (pImage != NULL && getUIImageFromBuffer(pImage))
	{
		std::string fullpath = CCFileUtils::getWriteablePath() + fileName;
		if (kCCImageFormatPNG == format)
		{
			fullpath += ".png";
		}
		else
		{
			fullpath += ".jpg";
		}
		
		bRet = pImage->saveToFile(fullpath.c_str());
	}

	CC_SAFE_DELETE(pImage);

	return bRet;
}

/* get buffer as UIImage */
bool CCRenderTexture::getUIImageFromBuffer(CCImage *pImage)
{
	if (NULL == pImage)
	{
		return false;
	}

	GLubyte *pBuffer = NULL;
	GLubyte *pTempData = NULL;
	bool bRet = false;

	do
	{
		CCAssert(m_ePixelFormat == kCCTexture2DPixelFormat_RGBA8888, "only RGBA8888 can be saved as image");

		CCSize s = m_pTexture->getContentSizeInPixels();
		int tx = (int)s.width;
		int ty = (int)s.height;

		CC_BREAK_IF(! (pBuffer = new GLubyte[tx * ty * 4]));
		CC_BREAK_IF(! (pTempData = new GLubyte[tx * ty * 4]));

		// On some machines, like Samsung i9000, Motorola Defy,
		// the dimension need to be a power of 2
		int nReadBufferWidth = 0;
		int nReadBufferHeight = 0;
		int nMaxTextureSize = 0;
		glGetIntegerv(GL_MAX_TEXTURE_SIZE, &nMaxTextureSize);

		for (int i = 0; i <= 12; i++)
		{
			int nPowerTwo = (int)pow(2.0f, (float)i);
			if (0 == nReadBufferWidth && tx <= nPowerTwo)
			{
				nReadBufferWidth = nPowerTwo;
			}
			if (0 == nReadBufferHeight && ty <= nPowerTwo)
			{
				nReadBufferHeight = nPowerTwo;
			}
		}

		CC_BREAK_IF(0 == nReadBufferWidth || 0 == nReadBufferHeight);
		CC_BREAK_IF(nReadBufferWidth > nMaxTextureSize || nReadBufferHeight > nMaxTextureSize);

		CC_BREAK_IF(! (pTempData = new GLubyte[nReadBufferWidth * nReadBufferHeight * 4]));
		this->begin();
		glPixelStorei(GL_PACK_ALIGNMENT, 1);
		glReadPixels(0,0,nReadBufferWidth,nReadBufferHeight,GL_RGBA,GL_UNSIGNED_BYTE, pTempData);

		this->end();

		// to get the actual texture data 
		// #640 the image read from rendertexture is upseted
		for (int i = 0; i < ty; ++i)
		{
			memcpy(&pBuffer[i * tx * 4], 
				&pTempData[(ty - i - 1) * nReadBufferWidth * 4], 
				tx * 4);
		}

		bRet = pImage->initWithImageData(pBuffer, tx * ty * 4, CCImage::kFmtRawData, tx, ty, 8);
	} while (0);

	CC_SAFE_DELETE_ARRAY(pBuffer);
	CC_SAFE_DELETE_ARRAY(pTempData);

	return bRet;
}


CCData * CCRenderTexture::getUIImageAsDataFromBuffer(int format)
{
    CC_UNUSED_PARAM(format);
    CCData *  pData     = NULL;
//@ todo CCRenderTexture::getUIImageAsDataFromBuffer

// #include "Availability.h"
// #include "UIKit.h"

//     GLubyte * pBuffer   = NULL;
//     GLubyte * pPixels   = NULL;
//     do 
//     {
//         CC_BREAK_IF(! m_pTexture);
// 
//         CCAssert(m_ePixelFormat == kCCTexture2DPixelFormat_RGBA8888, "only RGBA8888 can be saved as image");
// 
//         CCSize s = m_pTexture->getContentSizeInPixels();
//         int tx = s.width;
//         int ty = s.height;
// 
//         int bitsPerComponent = 8;
//         int bitsPerPixel = 32;
// 
//         int bytesPerRow = (bitsPerPixel / 8) * tx;
//         int myDataLength = bytesPerRow * ty;
// 
//         CC_BREAK_IF(! (pBuffer = new GLubyte[tx * ty * 4]));
//         CC_BREAK_IF(! (pPixels = new GLubyte[tx * ty * 4]));
// 
//         this->begin();
//         glReadPixels(0,0,tx,ty,GL_RGBA,GL_UNSIGNED_BYTE, pBuffer);
//         this->end();
// 
//         int x,y;
// 
//         for(y = 0; y <ty; y++) {
//             for(x = 0; x <tx * 4; x++) {
//                 pPixels[((ty - 1 - y) * tx * 4 + x)] = pBuffer[(y * 4 * tx + x)];
//             }
//         }
// 
//         if (format == kCCImageFormatRawData)
//         {
//             pData = CCData::dataWithBytesNoCopy(pPixels, myDataLength);
//             break;
//         }

        //@ todo impliment save to jpg or png
        /*
        CGImageCreate(size_t width, size_t height,
        size_t bitsPerComponent, size_t bitsPerPixel, size_t bytesPerRow,
        CGColorSpaceRef space, CGBitmapInfo bitmapInfo, CGDataProviderRef provider,
        const CGFloat decode[], bool shouldInterpolate,
        CGColorRenderingIntent intent)
        */
        // make data provider with data.
//         CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault;
//         CGDataProviderRef provider		= CGDataProviderCreateWithData(NULL, pixels, myDataLength, NULL);
//         CGColorSpaceRef colorSpaceRef	= CGColorSpaceCreateDeviceRGB();
//         CGImageRef iref					= CGImageCreate(tx, ty,
//             bitsPerComponent, bitsPerPixel, bytesPerRow,
//             colorSpaceRef, bitmapInfo, provider,
//             NULL, false,
//             kCGRenderingIntentDefault);
// 
//         UIImage* image					= [[UIImage alloc] initWithCGImage:iref];
// 
//         CGImageRelease(iref);	
//         CGColorSpaceRelease(colorSpaceRef);
//         CGDataProviderRelease(provider);
// 
// 
// 
//         if (format == kCCImageFormatPNG)
//             data = UIImagePNGRepresentation(image);
//         else
//             data = UIImageJPEGRepresentation(image, 1.0f);
// 
//         [image release];
//     } while (0);
//     
//     CC_SAFE_DELETE_ARRAY(pBuffer);
//     CC_SAFE_DELETE_ARRAY(pPixels);
	return pData;
}

} // namespace cocos2d